Princes William and Harry have opened up about their mum for a new BBC show

What is Diana about and who does it feature?

Diana tells the inside story of the tumultuous and unprecedented week that followed the death of Diana, Princess of Wales, exploring how she came to have such an extraordinary effect on the nation and people around the world.

The film features in-depth interviews with her sons, the Duke of Cambridge and Prince Harry, speaking in detail about that week’s events from the moment they heard the news of their mother’s death to the day of the funeral itself.

They also reflect more broadly on her life and what she meant to them both then and now.

The film also includes interviews with family members, close friends, political figures and journalists, many of them speaking for the first time about the events of that week.

When is Diana on BBC One?

The documentary Diana is expected to air in August 2017, although no official date has been given.

It is likely to coincide with the 20th anniversary of her death which falls on the 31st August.

Directed by Henry Singer (Baby P: The Untold Story; 9/11: The Falling Man), it will last for 90 minutes.